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       /* console.log( Number.isInteger(15))
        console.log( Number.isInteger(25))
        console.log(Number.isNaN(NaN))*/

        /*console.log(Number.parseInt(32.5))
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          //Math.trunc去掉一部分返回整数
          //Math.sig判断一个数是不是整数 
            
         console.log(Math.trunc('8.25'))
         console.log(Math.sign('foo'))
         console.log(Math.hypot(3, 4, 5))
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